Hildur & Gripsholms Slott
The boat Hildur and Gripsholm Castle on the shore of Lake Mälaren in Mariefred, municipality of Strängnäs, Sweden.
A fortress was built at the location around 1380 by Bo Jonsson (Grip), and belonged to his family until the confiscation of mansions and castles by King Gustav I (Gustav Vasa) in 1526. The King tore it down, and built a fortified castle with corner towers and a wall, for defensive purposes. Of the original medieval fortress, only the façade of a wall remains.
Since Gustav Vasa, Gripsholm has belonged to the Swedish Royal Family, and was used as their residence until 1713. Between 1563 and 1567, King Eric XIV imprisoned John III Vasa and his wife Catherine Jagiellon in the castle. Their son Sigismund III Vasa, later the King of Poland and Sweden, was born there in June 20, 1566.
The castle was again used as a prison between 1713 and 1773, before it was renovated by King Gustav III on behalf of his wife. A theater was also added at this time.
Between 1889 and 1894, the castle underwent a heavy and controversial restoration by the architect Fredrik Lilljekvist during which many of the 17th and 18th-century alterations was removed. The largest change was the addition of a third floor.
Today part of the castle houses the National Collection of Portraits, the oldest portrait collection in the world